Milling-machine.



A. J. HOWD.

MILLING MACHINE. l APPLICATION man MAW/29.1917.

Patented Nov. 12, 1918".`

2 SHEETS-SHEET l.

w milf A. J. HOWD.

. MILLING MACHINE.

APPLICATION min III/w29, 1911.

l ,28%3445 I Patented Nov. 1 2, 1918.

2 SHEETS-SHEET 2.

SMM@

@Hoz nativ ALVAH JEWEL HOWD, F NAMPA, IDAHO.'

MILLING-montan.

recrear.

specification 'of Letters Patent.

Patented Nev. ie, raie.

Application filed May 29, 1917. Serial lilo. 171,673.

. a citizen of the United States, residing at referred to patent,

Nampa, in the county of Canyon and State of Idaho, have invented certain new and useful Improvements in Milling-Machines, of which the-following is a specification.

This invention relates to improvements in milling machines and more particularly to machines adapted to operate upon castings of irregular shapes.

@ne of the objects of the present invention is to provide a milling machine of the above character particularly adapted for use on castings forming parts of the improved rotary gas engine illustrated and described in my patent dated June'th, 1917, 1,229,17 9. A further object is to provide a milling machine of the above character which will b ereliable, eiiicient and largely automatic in j use and operation and having relatively fewv parts which will be inexpensive to manufacture.

- Other objects will be in part obvious from the annexed drawings and in part-indicated in connection therewith by the'following analysis of this invention.

This invention accordingly consists in the features of construction, combination. of parts andin the unique relations of the members andin the relative proportioning and disposition thereof, all as more'cornpletely outlined'herein.

To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody thev same by the numerous modificationsl in structure and relation contemplated by this invention, drawings depicting a preferred form have been annexed as a part of this disclosure,

and in such drawings like vcharacters of ref-l erence denote corresponding parts throughout all the views; in which- Figure 1 is an elevational view showing such parts of the complete machine as are Vp lshaft 22 for the purpose ofdrlving the necessary to understand the invention; y Fig. 2 is a section on line 1-1'of Fig. 1.1 Fig. 3 is a sectional view section being taken longitudinally of one of the grooves 6 on line 3-43, Fig. 2, and showing a cutter operating in the groove.

The present ,invention is particularly adapted for use upon side wall castings of thel rotary gas engine shown in my abovewhich castings have a of the work, the' relatively fiat surface containing a series of cyhnders formed by concaved depressions gradually increasing in depth toward their center and of such curvature as to receive piston heads of a rotary piston member carrled by a rotor revolving between two such plates. This casting is indicated at 5 in Fig. l and the openmgs or cylinders at 6. Each groove 6, at its ends is relatively wide, but shallow, while at its middle it is relatively deeper, vand undercut so as to leave overhanging portion 6, defining a relatively narrow throat or gullet. rlhese grooves extend,- as will be seen from Fig. 1, in directions tangential to a circle concentric to the axialcenter of the work.

The milling machine comprises a suitable holder is provided with a circumferential rack 10 engaging a worm 11 mounted upon a shaft 12 in the bed of the machine whereby the casting is rotated at a predetermined rate of speed as will be hereinafter more fully explained. A cutter head ing the cutter-head with irespectv to the,

casting.- 4

A. source of'power indicated by belt 18 is' connected with pullys`20 and drives' a main 'shaft 21 for turning the cutters.l A second shaft 22 is mounted parallel to the shaft-21 and both shafts are provided with a series of speed-reducing gears 23 for the purpose of driving'agear 24 mounted upon a sleeve shaft 25 atgreatly reduced speed. This t sleeve shaft 25 extends through 'the upright 14 and is adapted to rotate the cutter head 13 at the desired rate of speed. il.v second inion 26 meshes with a pinion 27 upon the 13 is supported-by an upvright 14 on an auxiliary bed v15 which may worm and gear mechanism for rotating the ing the work. c 6. A machine of the character described including a rotary work holder, a main shaft extending parallel to the work holder, a cutter carried by the shaft with its axis at an angle thereto, the cutter being revoluble bodily around the main shaft and being also rotatable on its own axis, and means for revolvingl the cutter bodily around and in a plane at right angles to the main shaft, and to the plane of rotation of the work, and means for simultaneously rotating the work in the same general direction as the bodily movement of the cutter when itis in contact with the work. L

7 A machine of the character described including a rotary work holder, a main shaft extending dparallel to the work holder, a cutter carrie by the shaft with its axis at an angle thereto, the cutter being revoluble bodily around the main shaft and being also rotatable on its own axis, and means for revolving the cutter bodily around and in a plane at right angles to the main shaft, and tothe plane of rotation of the work, and means for simultaneously rotating the work in the same general direction as the direction of revolution of the cutter when it is in contact with the work but at a speed different from the speed of revolution of the cutter around the axis of the shaft.

8. A machine of the character described including a rotatable work holder, a rotatable cutter, a main shaft extending parallel to the work holder, a cutter shaft uponwhich the cutter is mounted and extending radially from saidvmain shaft, independent means for rotating the' main shaft and the cutter shaft, and means for rotating the work at a predetermined speedand rotating the main shaft at another predetermined speed, said main shaft extendingtangentially to a circle concentric to the center of motionl of the work, and the plane of revolution of the cutter around the main shaft being tangential to a circle concentric with the work.

9. A machine of the character described including a rotatable work holder, a` main shaft extending parallel to the work holder,

Vmeans for rotating said main shaft, a plurality of radial cutter shafts mounted upon the main shaft and rotatable therewith in va plane at right angles to the plane of the f including a rotatable work holder, a main the work holder, a plurality of radially dis.

posed cutter shafts mounted upon the main shaft and rotatable therewith in a plane at. lright angles to the plane of rotation of the work holder, means for rotating the'radial shafts on their own axes, cutters mounted on the radial shafts for rotation therewith, the plane of'bodily revolution of said cutters aroundthe axis of the main shaft being tangential to a circle concentric to the center of motion of thevwork, said cutters being spherical in form.

11. A machine of the character described including a rotatable work holder, a main shaft extending parallel to the work holder means for rotating said 'main shaft, sai main shaft extending tangentially to a circle concentric tothe axis of the work holder, a plurality of radially disposed cutter shafts mounted upon the main shaft and rotatable Y 12. A machine of the character described including a rotatable workv holder having gear teeth on its circumference, a main shaft extending parallel to the work holder, means for applying power to the main shaft, the main shaft extending tangentially to a circle concentric to the axis of rotation of the work holder, a sleeve mounted `on the main l shaft and having radially dis osed cutters carried thereby, means driven y said main shaft for rot-ating said sleeve to carry `the cutters into and out of engagement with the work, means actuated by the main shaft for individually rotating said cutters, each around its own axis, a worm shaft engaging the teeth of the work holder, and means actuated by said main shaft for rotating said worm shaft, each of said cutters being formed at its end adjacent the axis of the main shaft with a hub having cutting teeth.

13. In a machine of the character described, a rotatable work holder, a spherical toothed cutter having a hub provided with peripheral cutting teeth, means for rotating the work holder at a predetermined speed, means for rotating the cutter, and means for carrying the cutter against the face of the work supported in said holder, causing said cutter to move with the work for a predetermined distance, and then out of t-he work,

the path of movement of the cutter "being to the face of the Work Wiil be disposed withlo disposed tangentially to a circle coneentiiI in the face of the Work with its hub int/erto the center of motion of the work and the seating seid Work.

axis of said path of movement extending n testimony whereof ax my signature tangentially to a circle concentric to the cen-v in presence of two Witnesses.. ter of motion of the Work, said center of ALVAH JEWEL HOWD.

motion of the cutter being disposed in such Witnesses: proximity te the face of the work that the E L. BBOWNE, cutterwhen its axis extends at right angles K. E. Kimm. 

